Smoke Detectors - Carrier 50TCQD17-D24 Service And Maintenance Instructions

Low- - Voltage Control
low- - voltage control leads from the heater module(s) - -
VIO and BRN (two of each if two modules are installed;
identify for Module #1) - - to the 4- - pole terminal board
TB4 located on the heater bulkhead to the left of Heater
#1. Connect the VIO lead from Heater #1 to terminal
TB4- - 1. Connect the VIO lead from Heater #2 to terminal
TB4- - 2. Connect both BRN leads to terminal TB4- - 3. See
Fig. 35.

SMOKE DETECTORS

Smoke detectors are available as factory- - installed options
on 50TCQ models. Smoke detectors can be specified for
Supply Air only or for Return Air with or without
economizer or in combination of Supply Air and Return
Air. Return Air smoke detectors are arranged for vertical
return configurations only. All components necessary for
operation are factory- - provided and mounted. The unit is
factory- - configured for
shutdown operation; additional wiring or modifications to
unit terminal board can be necessary to complete the unit
and smoke detector configuration to meet project
requirements.
System
The smoke detector system consists of a four- - wire
controller and one or two sensors. Its primary function is
to shut down the rooftop unit in order to prevent smoke
from circulating throughout the building. It is not to be
used as a life saving device.
Duct Smoke Sensor
Controller Housing
and Electronics
Conduit Couplings
(supplied by installer)
Fastener
(2X)
Cover Gasket
(ordering option)
Alarm
Fig. 39 - - Controller Assembly
Connections — Pull
immediate smoke detector
Controller
Conduit Nuts
(supplied by installer)
Conduit Support Plate
Terminal Block Cover
Controller Cover
Trouble
Power
Test/Reset
Switch
C08208
Controller
the
The controller (see Fig. 39) includes a controller housing,
a printed circuit board, and a clear plastic cover. The
controller can be connected to one or two compatible duct
smoke sensors. The clear plastic cover is secured to the
housing with a single captive screw for easy access to the
wiring terminals. The controller has three LEDs (for
Power, Trouble and Alarm) and a manual test/reset button
(on the cover face).
Sensor
The sensor (see Fig. 40) includes a plastic housing, a
printed circuit board, a clear plastic cover, a sampling
tube inlet and an exhaust tube. The sampling tube (when
used) and exhaust tube are attached during installation.
The sampling tube varies in length depending on the size
of the rooftop unit. The clear plastic cover permits visual
inspections without having to disassemble the sensor. The
cover attaches to the sensor housing using four captive
screws and forms an airtight chamber around the sensing
electronics. Each sensor includes a harness with an RJ45
terminal for connecting to the controller. Each sensor has
four LEDs (for Power, Trouble, Alarm and Dirty) and a
manual test/reset button (on the left- - side of the housing).
See Detail A
Intake
Gasket
TSD-CO2
(ordering option)
Plug
Sampling Tube
(ordered separately)
Detail A
Magnetic
Test/Reset
Switch
Fig. 40 - - Smoke Detector Sensor
26
Duct Smoke Sensor
Exhaust Tube
Exhaust Gasket
Sensor Housing
and Electronics
Cover Gasket
(ordering option)
Coupling
Alarm Power
Trouble Dirty
Sensor Cover
C08209